Sometimes you need to save a locally created file to S3 instead of an uploaded file (the standard). Here is how:

has_attached_file :tagged_text_file,  STORAGE_OPTIONS.merge({
  :processors   => []
})

...

def save_tagged_text_file
  file = File.open("#{RAILS_ROOT}/tmp/tagged_text_#{id}.txt", 'w+')
  file << tagged_text
  self.tagged_text_file = file
  save!
  file.close
end